Light-dependent reduction of selenite by sonicated pea chloroplasts

Jablonski, Peter P.; Anderson, John W.

doi:10.1016/0031-9422(82)85173-x

Cited by 13 publications

(4 citation statements)

References 18 publications

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“…ATP suplhurylase is the next enzyme that is probably responsible for selenium tolerance. This enzyme catalyzes the formation of both adenosine 5 -phosphosulfate (APS) and adenosine 5 -phosphoselenate (APSe) from ATP, and sulfate or selenate and its accumulation in plants Murillo and Leustek, 1995;Raspor et al, 2003), as well as APS reductase with the ability to reduce APS to selenite (Sors et al, 2005), that can then be nonenzymatically reduced by glutathione (Ng and Anderson, 1978) despite the reduction of selenodiglutathione and selenopersulfide into selenocysteine (SeCys); this pathway takes place in chloroplasts (Aketagawa and Tamura, 1980;DeSouza et al, 2000;Jablonski and Anderson, 1982;Muller et al, 1997). Cys (as well as SeCys) can enter the Met biosynthetic pathway to form Met and SeMet respectively (Lauchli, 1993), which can represent the majority of the total Se in plants (Kotrebai et al, 2000).…”

Section: Seleniummentioning

confidence: 99%

Uncommon Heavy Metals, Metalloids and Their Plant Toxicity: A Review

Babula

Adam

Opatřilová

et al. 2009

Sustainable Agriculture Reviews

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Heavy metals represent a group of dangerous pollutants, to which is paid close attention. Many heavy metals are essential as important constituents of pigments and enzymes-mainly zinc, nickel, and copper. However, all metals, especially cadmium, lead, mercury, and copper, are toxic in high concentrations because they disrupt enzyme functions, replacing essential metals in pigments or producing reactive oxygen species. The toxicity of less common heavy metals and metalloids, such as thallium, arsenic, chromium, antimony, selenium, and bismuth has been investigated. Here we review the phytotoxicity of thallium, chromium, antimony, selenium, bismuth; and other rare heavy metals and metalloids such as

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Section: Seleniummentioning

confidence: 99%

Uncommon Heavy Metals, Metalloids and Their Plant Toxicity: A Review

Babula

Adam

Opatřilová

et al. 2009

Sustainable Agriculture Reviews

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“…These electrons are transported through NADP(H) (nicotinamide adenine dinucleotide phosphate) and GSH (glutathione)/GSSG (glutathione disulfide), to reach SeO 3 2− as their final acceptors, forming Se 2− . Afterwards, Se 2− can be transformed into SeCys in the presence of O-Acetylserine, or be non-enzymatically oxidized to Se 0 [ 36 ]. Our inability to detect organic forms of Se could also be due to the laser induced photodegradation of selenoproteins, resulting in formation of individual SeCys molecules, which could be then reduced to Se 0 by the lyase enzyme.…”

Section: Resultsmentioning

confidence: 99%

Raman Microspectroscopic Analysis of Selenium Bioaccumulation by Green Alga Chlorella vulgaris

et al. 2021

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Selenium (Se) is an element with many commercial applications as well as an essential micronutrient. Dietary Se has antioxidant properties and it is known to play a role in cancer prevention. However, the general population often suffers from Se deficiency. Green algae, such as Chlorella vulgaris, cultivated in Se-enriched environment may be used as a food supplement to provide adequate levels of Se. We used Raman microspectroscopy (RS) for fast, reliable, and non-destructive measurement of Se concentration in living algal cells. We employed inductively coupled plasma-mass spectrometry as a reference method to RS and we found a substantial correlation between the Raman signal intensity at 252 cm−1 and total Se concentration in the studied cells. We used RS to assess the uptake of Se by living and inactivated algae and demonstrated the necessity of active cellular transport for Se accumulation. Additionally, we observed the intracellular Se being transformed into an insoluble elemental form, which we further supported by the energy-dispersive X-ray spectroscopy imaging.

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“…In Se hyperaccumulating plants, the enzyme selenocysteine methyltransferase that has the ability to accumulate large amounts of SeCys and probably also MeSeCys (Ellis et al 2004;LeDuc et al 2004;Shrift and Ulrich 1969;Sors et al 2005), as well as the ability to reduce selenate to organic compounds, plays crucial role in Se tolerance (Neuhierl and Bock 1996). ATP suplhurylase is the next enzyme that is probably responsible for selenium tolerance; this enzyme catalyzes the formation of both adenosine 5 0 -phosphosulfate (APS) and adenosine 5 0 -phosphoselenate (APSe) from ATP and sulfate or selenate and its accumulation in plants Murillo and Leustek 1995;Raspor et al 2003), as well as APS reductase, with its ability to reduce APSe to selenite (Sors et al 2005) that can consequently be reduced nonenzymatically by glutathione (Ng and Anderson 1978), despite reducing selenodiglutathione and selenopersulfide to selenocysteine SeCys; this pathway takes place in chloroplasts (Aketagawa and Tamura 1980;DeSouza et al 2000;Jablonski and Anderson 1982;Muller et al 1997). Cys and SeCys can enter the Met biosynthetic pathway to form Met and SeMet, respectivelly (Lauchli 1993), that can represent the majority of total Se amount in plants ( Kotrebai et al 2000).…”

Section: Seleniummentioning

confidence: 99%

Uncommon heavy metals, metalloids and their plant toxicity: a review

et al. 2008

View full text Add to dashboard Cite

Heavy metals still represent a group of dangerous pollutants, to which close attention is paid. Many heavy metals are essential as important constituents of pigments and enzymes, mainly zinc, nickel and copper. However, all metals, especially cadmium, lead, mercury and copper, are toxic at high concentration because of disrupting enzyme functions, replacing essential metals in pigments or producing reactive oxygen species. The toxicity of less common heavy metals and metalloids, such as thallium, arsenic, chromium, antimony, selenium and bismuth, has been investigated. Here, we review the phytotoxicity of thallium, chromium, antimony, selenium, bismuth, and other rare heavy metals and metalloids such as tellurium, germanium, gallium, scandium, gold, platinum group metals (palladium, platinum and rhodium), technetium, tungsten, uranium, thorium, and rare earth elements yttrium and lanthanum, and the 14 lanthanides cerium, dysprosium, erbium, europium, gadolinium, holmium, lutetium, neodymium, promethium, praseodymium, samarium, terbium, thulium and ytterbium.

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Light-dependent reduction of selenite by sonicated pea chloroplasts

Cited by 13 publications

References 18 publications

Uncommon Heavy Metals, Metalloids and Their Plant Toxicity: A Review

Uncommon Heavy Metals, Metalloids and Their Plant Toxicity: A Review

Raman Microspectroscopic Analysis of Selenium Bioaccumulation by Green Alga Chlorella vulgaris

Uncommon heavy metals, metalloids and their plant toxicity: a review

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